Enable Emmet in .JSX files, using Babel JSX Syntax highlighter

gistfile1.txt

// add to Preferences > Key Bindings - User
// see http://stackoverflow.com/a/26619524 for context

{ "keys": ["tab"], "command": "expand_abbreviation_by_tab",
  "context": [
    {
      "operand": "source.js", 
      "operator": "equal", 
      "match_all": true, 
      "key": "selector"
    },
    {   
      "key": "selection_empty", 
      "operator": "equal", 
      "operand": true,
      "match_all": true 
    }
  ]
},
{ "keys": ["tab"], "command": "next_field", "context":
  [
    { "key": "has_next_field", "operator": "equal", "operand": true }
  ]
}